At least 25 people were killed and more than 50 wounded when gunmen attacked Afghanistan's biggest military hospital after two heavy explosions at the site in central Kabul, officials said.

The explosions hit the entrance of the 400-bed Sardar Mohammad Daud Khan hospital and were followed with an assault by a group of Islamic State gunmen, all of whom were killed within 15 minutes, Taliban spokesman Zabihullah Mujahid said.

He said Taliban special forces dropped by helicopter had prevented the attackers from entering the hospital itself, with all killed at the entrance or in the courtyard. Earlier another spokesman said one of the attackers was captured.

- Reuters -